Firewire external hard drives won't mount after using Windows Vista

Hi to All,
I installed Windows Vista Business in a SATA hard drive I added to my Mac Pro. Every time I select the HD from the start up disk in my preferences and restart, the next time I start up with Mac OS 10.6.1 all my firewire devices don't mount. I have to shut down my Mac unplug the power cord for a few minutes to get my firewire devices back. Do you know of any workarounds to this issue? Thanks in advance!

Yea, don't use Snow Leopard or don't use Firewire for now.
Nothing to do with Vista Business.

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